The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 14, 2002
Filed:
Mar. 09, 1998
Applicant:
Inventors:
Assignee:
Fujitsu Limited, Kawasaki, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06F 9/455 ; G06F 1/750 ;
U.S. Cl.
CPC ...
G06F 9/455 ; G06F 1/750 ;
Abstract
A method and apparatus for calculating circuit delay times efficiently arranges and stores data to reduce system memory requirements, which allows computers without large storage devices, such as conventional personal computers with limited hard disk space, to be used for testing preliminary device designs, Delay time ratio coefficient values representing a ratio of a delay time determined by values of dependency factors having a large correlation with one another to a predetermined reference delay time of a circuit element are stored in a coefficient table. The dependency factors include process condition, in use or operational temperature, and first and second operational supply voltages.